Upgrading to MATE Desktop 1.16 will remove the mate-netspeed packages, but don't be alarmed, the NetSpeed applet is now included in the mate-applets package. You won't loose any functionality.

If you see the following prompt during the upgrade, then press Enter to accept [default=N]:

Configuration file '/etc/xdg/autostart/mate-volume-control-applet.desktop'
==> Deleted (by you or by a script) since installation.
==> Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
Z : start a shell to examine the situation
The default action is to keep your current version.
*** mate-volume-control-applet.desktop (Y/I/N/O/D/Z) [default=N] ?

The version of MATE 1.16 in this PPA is (mostly) built against GTK2+ to ensure compatibility with Ubuntu MATE 16.04 and all 3rd party MATE applets, plugins and extensions.

Adding this PPA to your system

You can update your system with unsupported packages from
this untrusted PPA by adding ppa:ubuntu-mate-dev/xenial-mate
to your system's Software Sources.
(Read about installing)